.page-about {
  --ab-line: rgba(244, 246, 248, 0.1);
  --ab-line-soft: rgba(244, 246, 248, 0.06);
  --ab-gap: clamp(2.5rem, 1.8rem + 3vw, 4.5rem);
  background-color: var(--ink);
  color: var(--paper);
  overflow-x: clip;
  padding-bottom: clamp(2rem, 1.5rem + 2vw, 3.5rem);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
}

.page-about h1 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: var(--fs-display);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0.4rem 0 1rem;
}

.page-about h2 {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: var(--fs-h2);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0.35rem 0 0.75rem;
}

.page-about h3 {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: var(--fs-h3);
  line-height: 1.35;
  margin-bottom: 0.45rem;
}

.page-about p {
  margin: 0 0 0.85rem;
  max-width: 38em;
  line-height: 1.75;
}

.page-about p:last-child {
  margin-bottom: 0;
}

.page-about .lede {
  color: var(--muted);
  max-width: 38em;
}

.page-about .breadcrumb {
  padding-top: clamp(1rem, 0.8rem + 1vw, 1.6rem);
  font-size: var(--fs-micro);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(120% 95% at 88% 0%, rgba(14, 124, 147, 0.38), transparent 62%),
    radial-gradient(85% 75% at 4% 100%, rgba(200, 16, 46, 0.22), transparent 66%);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--ab-line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--ab-line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 88%);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 88%);
}

.page-about .hero-collage {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.5rem, 1rem + 2vw, 2.25rem);
  padding-top: clamp(1.25rem, 1rem + 2vw, 2.5rem);
  padding-bottom: clamp(2.25rem, 1.6rem + 3vw, 3.75rem);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.page-about .hero-stats {
  display: grid;
  gap: 0.7rem;
  align-content: end;
}

.page-about .stat {
  position: relative;
  padding: 1rem 1.15rem 1.1rem;
  background: linear-gradient(155deg, rgba(26, 31, 36, 0.94), rgba(21, 26, 30, 0.62));
  border: 1px solid var(--ab-line);
  box-shadow: var(--shadow-sm);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 1.25rem + 1.5vw, 2.25rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .stat__num--cyan {
  color: var(--cyan);
}

.page-about .stat__num--paper {
  color: var(--paper);
}

.page-about .stat__label {
  display: block;
  margin-top: 0.4rem;
  font-size: var(--fs-micro);
  color: var(--muted);
  letter-spacing: 0.05em;
}

/* ---------- Sections ---------- */
.page-about .about-section {
  padding: var(--ab-gap) 0 0;
}

.page-about .section-head {
  margin-bottom: clamp(1.5rem, 1.1rem + 1.6vw, 2.5rem);
}

.page-about .about-section--board {
  position: relative;
}

.page-about .about-section--board::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(26, 31, 36, 0.55), transparent 45%);
}

.page-about .about-section--board > .wrap {
  position: relative;
  z-index: 1;
}

/* ---------- Timeline ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 1.6rem minmax(0, 1fr);
  column-gap: 0.9rem;
  padding-bottom: 1.75rem;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  bottom: 0;
  left: 6px;
  width: 1px;
  background: linear-gradient(to bottom, var(--ab-line) 0%, var(--ab-line) 72%, transparent 100%);
}

.page-about .tl__item:last-child {
  padding-bottom: 0;
}

.page-about .tl__item:last-child::before {
  background: linear-gradient(to bottom, var(--ab-line) 0%, transparent 55%);
}

.page-about .tl__node {
  grid-column: 1;
  grid-row: 1;
  width: 14px;
  height: 14px;
  margin-top: 0.28rem;
  background: var(--red);
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
  box-shadow: 0 0 0 6px var(--ink);
  transition: background 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .tl__node--live {
  background: var(--lime);
}

.page-about .tl__item:hover .tl__node {
  background: var(--cyan);
  box-shadow: 0 0 0 6px var(--ink), 0 0 14px rgba(34, 211, 238, 0.55);
}

.page-about .tl__body {
  grid-column: 2;
  grid-row: 1;
}

.page-about .tl__time {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .tl__body p {
  color: var(--muted);
  font-size: var(--fs-body);
}

.page-about .tl__data {
  grid-column: 2;
  grid-row: 2;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.7rem;
  padding: 0.6rem 0.9rem;
  border-left: 2px solid var(--red-deep);
  background: linear-gradient(90deg, rgba(26, 31, 36, 0.9), rgba(26, 31, 36, 0));
  transition: background 180ms var(--ease), box-shadow 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .tl__item:hover .tl__data {
  transform: translateY(-2px);
  background: linear-gradient(90deg, rgba(34, 211, 238, 0.12), rgba(26, 31, 36, 0));
  box-shadow: var(--shadow-sm);
}

.page-about .tl__num {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--lime);
  white-space: nowrap;
}

.page-about .tl__unit {
  font-size: var(--fs-micro);
  color: var(--muted);
  letter-spacing: 0.05em;
}

/* ---------- Figures ---------- */
.page-about .ab-fig {
  margin: 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ab-line);
  background: var(--panel-deep);
  box-shadow: var(--shadow-sm);
}

.page-about .ab-fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-fig--banner img {
  aspect-ratio: 5 / 2;
}

.page-about .ab-fig--band img {
  aspect-ratio: 12 / 5;
}

.page-about .ab-fig--std img {
  aspect-ratio: 4 / 3;
}

.page-about .ab-fig figcaption {
  padding: 0.7rem 0.95rem;
  font-size: var(--fs-micro);
  color: var(--muted);
  letter-spacing: 0.05em;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-fig--banner {
  margin-bottom: clamp(1.25rem, 1rem + 1.5vw, 2rem);
}

.page-about .ab-fig--band {
  margin-bottom: clamp(1.25rem, 1rem + 1.5vw, 2rem);
}

/* ---------- Team board ---------- */
.page-about .team-board {
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  box-shadow: var(--shadow-sm);
}

.page-about .team-cell {
  background: var(--panel-deep);
  padding: clamp(1rem, 0.85rem + 0.6vw, 1.5rem);
  outline: none;
  transition: background 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .team-cell:hover,
.page-about .team-cell:focus-visible {
  background: #1f252b;
  box-shadow: inset 0 0 0 1px rgba(34, 211, 238, 0.55);
}

.page-about .team-cell:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .team-cell p {
  color: var(--muted);
  font-size: var(--fs-small);
  line-height: 1.7;
  max-width: none;
}

.page-about .team-cell__tags {
  margin-top: 0.8rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--ab-line);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--cyan);
  letter-spacing: 0.04em;
}

/* ---------- Versions ---------- */
.page-about .version-list {
  border-top: 1px solid var(--ab-line);
}

.page-about .version {
  border-bottom: 1px solid var(--ab-line);
}

.page-about .version summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0.25rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: var(--fs-h3);
  color: var(--paper);
  transition: color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .version summary::-webkit-details-marker {
  display: none;
}

.page-about .version summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--cyan);
  flex: 0 0 auto;
}

.page-about .version[open] summary::after {
  content: "－";
}

.page-about .version summary:hover,
.page-about .version summary:focus-visible {
  color: var(--cyan);
}

.page-about .version summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .version__body {
  padding: 0 0.25rem 1.25rem;
}

.page-about .version__body p {
  color: var(--muted);
  font-size: var(--fs-body);
}

/* ---------- Flow ---------- */
.page-about .flow-grid {
  display: grid;
  gap: clamp(1.25rem, 1rem + 2vw, 2rem);
}

.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
  padding: clamp(0.95rem, 0.8rem + 0.6vw, 1.35rem);
  background: var(--panel-deep);
  transition: background 180ms var(--ease);
}

.page-about .step:hover {
  background: #1f252b;
}

.page-about .step__idx {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.03em;
}

.page-about .step__title {
  margin-bottom: 0.35rem;
}

.page-about .step p {
  color: var(--muted);
  font-size: var(--fs-small);
  line-height: 1.7;
  max-width: none;
}

/* ---------- Cooperation ---------- */
.page-about .coop-grid {
  display: grid;
  gap: clamp(1.5rem, 1.1rem + 2vw, 2.5rem);
}

.page-about .coop-grid p {
  color: var(--muted);
}

.page-about .coop-grid .btn {
  margin-top: 0.4rem;
}

.page-about .coop-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  align-content: start;
}

.page-about .coop-list li {
  display: grid;
  gap: 0.35rem;
  padding: clamp(0.95rem, 0.8rem + 0.6vw, 1.3rem);
  background: var(--panel-deep);
  font-size: var(--fs-small);
  color: var(--muted);
  line-height: 1.65;
  border-left: 2px solid transparent;
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .coop-list li:hover {
  background: #1f252b;
  border-left-color: var(--cyan);
}

.page-about .coop-list__num {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: -0.01em;
}

/* ---------- Service list ---------- */
.page-about .svc-list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .svc-item {
  display: grid;
  gap: 0.3rem;
  padding: clamp(0.95rem, 0.8rem + 0.6vw, 1.3rem);
  background: var(--panel-deep);
}

.page-about .svc-item dt {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: var(--fs-small);
  color: var(--paper);
  letter-spacing: 0.02em;
}

.page-about .svc-item dd {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  padding-top: clamp(2.5rem, 1.8rem + 3vw, 4rem);
}

.page-about .cta-panel {
  border: 1px solid var(--ab-line);
  padding: clamp(1.5rem, 1.1rem + 2.5vw, 2.75rem);
  background:
    radial-gradient(115% 130% at 0% 0%, rgba(200, 16, 46, 0.38), transparent 62%),
    radial-gradient(90% 110% at 100% 100%, rgba(34, 211, 238, 0.18), transparent 60%),
    linear-gradient(150deg, rgba(26, 31, 36, 0.96), rgba(21, 26, 30, 0.72));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .cta-panel h2 {
  margin-bottom: 1.25rem;
}

.page-about .cta-links {
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .cta-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 1.1rem;
  background: rgba(14, 17, 20, 0.72);
  color: var(--paper);
  text-decoration: none;
  font-weight: 700;
  font-size: var(--fs-small);
  transition: background 180ms var(--ease), color 180ms var(--ease);
}

.page-about .cta-arrow {
  font-family: var(--font-mono);
  color: var(--cyan);
  transition: transform 180ms var(--ease);
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  background: rgba(34, 211, 238, 0.14);
  color: var(--cyan);
}

.page-about .cta-link:hover .cta-arrow,
.page-about .cta-link:focus-visible .cta-arrow {
  transform: translateX(4px);
}

.page-about .cta-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- Reveal ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

.page-about [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .stat:hover,
  .page-about .tl__item:hover .tl__data {
    transform: none;
  }
}

/* ---------- Breakpoints ---------- */
@media (min-width: 760px) {
  .page-about .team-board {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .cta-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .svc-item {
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 0.2rem 1.25rem;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .hero-collage {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .hero-stats {
    gap: 0.8rem;
  }

  .page-about .tl__item {
    grid-template-columns: minmax(0, 1fr) 5.5rem minmax(0, 1fr);
    column-gap: 0;
    padding-bottom: 2rem;
  }

  .page-about .tl__item::before {
    left: calc(50% - 0.5px);
    top: 0;
    bottom: 0.6rem;
  }

  .page-about .tl__node {
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    margin-top: 0.45rem;
  }

  .page-about .tl__body {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
    padding-right: 1.75rem;
  }

  .page-about .tl__body p {
    margin-left: auto;
  }

  .page-about .tl__data {
    grid-column: 3;
    grid-row: 1;
    display: block;
    margin-top: 0.4rem;
    padding: 0.6rem 0.9rem;
    border-left: 2px solid var(--red-deep);
    background: linear-gradient(90deg, rgba(26, 31, 36, 0.9), rgba(26, 31, 36, 0));
  }

  .page-about .tl__item:nth-child(even) .tl__body {
    grid-column: 3;
    text-align: left;
    padding-right: 0;
    padding-left: 1.75rem;
  }

  .page-about .tl__item:nth-child(even) .tl__body p {
    margin-left: 0;
  }

  .page-about .tl__item:nth-child(even) .tl__data {
    grid-column: 1;
    text-align: right;
    padding-right: 0.9rem;
    border-left: none;
    border-right: 2px solid var(--red-deep);
    background: linear-gradient(270deg, rgba(26, 31, 36, 0.9), rgba(26, 31, 36, 0));
  }

  .page-about .tl__num {
    font-size: 1.55rem;
  }

  .page-about .tl__unit {
    display: block;
    margin-top: 0.25rem;
  }

  .page-about .flow-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .coop-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .team-board {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .cta-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>